What type of behavior should security guards be vigilant about?

Security guards should primarily be vigilant about suspicious behavior that may indicate a security risk because such behaviors can pose a threat to the safety and security of the premises and its occupants. This type of vigilance is crucial for early detection of potentially harmful situations or criminal activities before they escalate. Suspicious behaviors could include individuals loitering in certain areas, unauthorized access to restricted zones, or unusual interactions that seem out of place.

While there are aspects of other choices that hold relevance—like routine behaviors of employees, which may help establish a baseline for what is considered normal—the primary focus of a security guard's vigilance should be on identifying behaviors that fall outside this norm and could signify a threat. Similarly, while monitoring all interactions with customers can be beneficial for customer service and safety, it is the recognition of suspicious activities that is most aligned with a security guard's primary responsibilities. Observing only violent confrontations neglects the importance of proactive measures that can prevent such confrontations from occurring in the first place. Therefore, maintaining a keen awareness of suspicious behavior is essential for effective security management.